| Week! | |
| Type: | single |
| Artist: | Do As Infinity |
| Album: | Deep Forest |
| Released: | May 30, 2001 |
| Genre: | J-pop |
| Length: | 13:51 |
| Label: | avex trax |
| Producer: | Dai Nagao, Seiji Kameda |
| Prev Title: | Tōku Made |
| Prev Year: | 2001 |
| Next Title: | Fukai Mori |
| Next Year: | 2001 |
"Week!" is the ninth single by Do As Infinity, released in 2001. The B-side, "Tsuredzure Naru Mama ni", is the only studio-recorded song by the guitarist Ryo Owatari, who also wrote the lyrics. The melody parallels that of song "Yesterday & Today". It was used as the theme song for the drama Yome wa Mitsuboshi.
This song was included in the band's compilation albums Do the Best and Do the A-side.